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Hi, I have designed an adc in cadence virtuoso and i want to calculate the metrics such as snr,SINAD,ENOB etc. For example i want to calculate ENOB. I read everywhere that i need to do an fft my input, or simply use the spectrumMeas function. So i am using a sinuid input of 875MHz as fin and 2GHz as flck. In the field in spectrumMeas i use (...)

## calculating snr in delsig toolbox

hello i was simulating of a first order adc using code given in book of richard scherier. for calculating snr he uses (page 265) snr = calculatesnr(spec(1:ceil(Nfft/(2*OSR))+1), tone_bin)... where spec is spec = fft(v.*ds_hann(Nfft))/(Nfft*(nLev-1)/4); (...)

## FFT analysis of ADC, how to explain the HD

Are there materials about the detail fft analysis of adc, such as how to determine the source of HD2, HD3 or higher HD? May be this treatise can be helpful?

## SNR calculation of Delta Sigma ADC after Modulator and After Decimation

hello Eminent.Engineer, I hve also designed a delta sigma adc and i calculate the snr order to caculate the snr after the modulator you must make the fast fourier transform function (fft) by MATLAB after the modulator. About the decimation,until now i have designed the complete adc in Smulink (MATLAB) (...)

## How to measure the SNR of an ADC without S/H?

method 2 is one i have used before. i set the dac to have 2 bits mode resolution than adc.

hi folks. i am trying to test the 10 bit pipelined adc schematic i designed. The procedure i am following for finding the SNDR is " take a sinusoidal input signal nearer to full scale range.Using an ideal DAC reconstruct the signal. Plot its fft ,say for 1024 points,take those values and find SNDR, THD, SFDR , snr from matlab by giving (...)

## can you give me a piece of MATLAB procedure to process the data from logic analysis

hi, all, i design a adc, and now it is tested, but i have no any software to get snr and THD+N THD..., but some digital data is sampled from a logic analysis device, and a piece of MATLAB procedure is need to get snr, THD+N, THD and the fft figure, but i can't compile the procedue. can you upload the procedure the (...)

## Sigma Delta ADC -SNR & SNDR calculation

hiiiiiiii I'm working on sigma Delta adc CAN ANY1 PLEASE HELP ME ON WORKING WITH CADENCE SPECTRE FOR snr CALCULATION HOW MANY CYCLES I SHOULD RUN THE TRANSIENT ANALYSIS?? IN ORDER TO CALCULATE snr PLEASE HELP ME IN FIGURING OUT THESE VALUES... how to come to conclusion to fft fundamental frequency of input (...)

## How can i calculate the SNR from the ADC data

I remember calculating SFDR for 100 Mhz adc. I see if I can find the C code for it and extrapolate equation and post it here. That might help you on the snr.

I have tried to estimate the snr of the sigma delta conversion after the sinc^3 filter and got lots of noise at the low frequency end. It looks like the opposite of noise shaping, see attached. When fft of the bitstream is plot the snr is almost twice as high for the same frequency. Am I using the sampling rate a lot higher than the signal I (...)

## hy we need t coherent sampling to calculate SNR in N-ADC's

Dear All, In N-adcs why we need to follow coherent sampling method for calculating snr. Bye.

## How do I prove the spec for column-parallel single slope ADC

Hi guys, I am currently designing a column parallel single slope adc for a CMOS image sensor. I have done the DC, AC and Transient analysis. I am aware that I need to do .fft to determine the snr and ENOB. Are there any other simulations that I may have missed? Appreciate all the help I can get. Thank you all! hyuuga_patik

## How to simulate the SNR and SFDR of DAC?

ideal adc + actual DAC the input signal is sine wave then fft the output signal of the DAC

## a problemn of ADC simulation with Hspice.

Hi all I use the HSPICE to simulate the whole pipeline adc. I want to check its snr. So i run the tran. simulation with 2048 points, then transfer the .tr0 file to matlab to fft to get the snr value. If i use 0.01ns transient step in tran simulation, the fft results is about more 60db (My (...)

HI... I AM PRASADH, I AM DOING MY PROJECT ON FLASH adc IN CADENCE.. HOW CAN I DO THE fft ANALYSIS IN CADENCE SPECTRE FOR MY CIRCUIT.. ACTUALLY I HAVE TO MEASUER SFDR,SNDR FOR MY CIRCUIT . CAN ANYONE HELP ME PLEASE.... THANK YOU

## Matlab Script for ADC SNR Post-Processing

Hi, I have some question regarding the script I got. Part of it is as follows: . . . % Create the minimum, 4-term Blackman-Harris window for fft pwr_win=0; for i=1:Nt %where Nt is the no. of fft bins window(1,i)=0.35875-0.48829*cos(2*pi*(i-1)/Nt)+0.14128*cos(4*pi*(i-1)/Nt)-0.01168*cos(6*pi*(i-1)/Nt); p

HI all i am simulation a pipeline adc. I give a sine input, and do .tran simulation in hspice. Then catch the 10-bit digital code to do fft in matlab. Then i want to know, the fft results can give the snr results? And is the noise compont included in the tran simulation results? What performance of (...)

## testing sfdr snr etc of a flash adc, also bit error rate

hi , i have implemented an flash adc in .35u process.......i want to check its dynamic specification..........please tell me in detail how to perform the test........(snr,sfdr) i have designed a new rom and want to cehck the error rate..........plzsz help me out in this

## the spurious signal in ADC

for calculating the SFDR for an adc . coudl u please tell me the origin of this spurious signal .. in adc

## Separation of signal from noise in sigma delta ADC

Hi, I am working on sigma delta modulator based adc. I have output bitstream from the modulator and would like to measure snr and SNDR using fft. How could I possibly separate the signal and noise from the output of modulator? Also, is there anyway to separate the noise and distortion from the total noise from the modulator output (...)

## Folding Interpolation ADC SNR problem

Hi Everyone, I have just designed a 8-bit folding interpolation adc. When I simulate my adc, I cannot get to 8-bit of resolution. The snr that I got from the power spectrum is only -30dB. The noise level is at -40dB. Is there any technique I can use to lower the noise level in the adc. Can anyone who has experience with (...)

## How can I get SNR, THD and SNDR from ADC output?

in simulation, I do fft of an adc's output, according to this result, it is easy to get SFDR, but how can I get snr, THD and SNDR? thank you very much!

## who know any methods to test INL and DNL of sigma-delta DAC

Hey, why do you want to measure the INL and DNL of a sigma delta adc? I am sure that you are not resolving any bits in analog domain. So, I have rarely heard about anyone talking of INL and DNL for a Sigma Delta adc.

hi! all~ i want to ask the questions about the pipelined adc's fft calcculate for snr SNDR i try to see many papers,but never see the detail calculate way, just only see some like that: (1) SNDR=power of signal/(noise + distortion) or SNDR=signal(db)-noise(db)-distortion(db) (2) SFDR=power of signal/(max distortion) (3) (...)

## some problems about Sample and hold circuit

Some of the most important specs for S/H in pipeline adc include snr and THD. You can simulate these parameters in HSPICE, without using spectreRF features. To do this, you need to calculate the kT/C noise and OTA noise contribution carefully due to inherent alias. Other than this, the THD performance can be simply measured by perform fft on (...)

## how to calculate the SNR and SNDR of the output of ADC

Hi, all, how to calculate the snr and SNDR of the bit stream (1-bit stream) of sigma-delta modulator, and the snr and SNDR of the output data of the all adc. need your helps. Thanks in advance. regards,

## Have any better solution to simulate INL....??

Understand the defination of DNL/INL then you can begin to simulate it. Do you know how to evaluate the DNL/INL of an actual adc? snr is calculated after fft analyse using Hspice. Dear All, How to simulate INL , DNL , snr by Hspice . When I do Histogram analysis,it needs many cycle. If I design 12Bits (...)

## How to calculate SNR in this case?

Hi all, I am design a 10bits pipeline adc and by followingprevious articles I use Matlab to do fft. But here are the problems I met. fin=100Khz, fs=10Mhz, N=8192(number of data points in fft), M=83 (integer number of cycles within the sampling window), First I used coherent sampling method to do fft and I got a (...)

## In simulation ADC SNR question?

i don't know there is really any option or not which can extact ur waveform into a text form or any other form. because i am also trying it with cadence simulator( cadence also uses spice to generate the netlist). But u can get the value manually and put the value in matlab to get the snr of adc.

## [Help] ADC or DAC measure for HSPICE

You can use the sandwork to read the HSPICE simulation result and use the adc analyzer in sandwork to do those measurement.

## How can I measure SNR from sigma delta ADC and decimation?

How can I measure snr from sigma delta adc and decimation after that but not to predict the snr ? In frequency domain low pass filter has perfect magnitude spectrum but I can't get the perfect mmse snr?I have already considered the delay on it. If anyone has opoins plz tell me,thx.

## How to calculate SNDR of ADC ??

hello!! Somebody can tell me !! How to calculate SNDR of adc?? How to find Matlab program that to analysis dynmic parameter of A/D Converter ?? thanks !!!